​Few worlds in the universe are as perfect as the planet Eos. Little wonder that humans have settled there. But so have the Gorgons, a race resembling the Medusa of Greek mythology, who don’t want to share it with anyone.

Hating all things human, the Gorgons attack the human colonies, slaughtering. Outnumbered and out-gunned, the colonists call for help from the Interstellar Association of Worlds, which sends hundreds of ships and a hundred thousand Marines to aid them.